Hi Vikas,
Glad to know that you have progressed in a steady path with your project.
To address your current - you need to retain xsd from PI team. The xsd that is available over console is a standard one & you cannot make changes to it.
To make changes to schema- you must get the xsd from PI team and save it on your local directory (temporaray fix). Now you can make changes to schema as you wish. To edit fields in schema , right click on schema and open with word pad or text editor. Later save changes and upload the same xsd under XML schema in Admin table.
Please see below screenshot- This would serve as an example. I had my local xsd saved on local drive to perform changes and later uploaded it under XML schema through browse option under "File Name". Hope this would help you !
P.S: Once you have performed changes to schema make sure XSD is saved on a common shared directory from where other developers can access it. XSD under XML schema table should contain common directory path so that others can navigate to the given directory and perform future changes in your absence, which is a standard practise.
Hope this information helps you! Please let me know if any further queries/concerns.
Regards,
Ali